If you’re 64 right now, Medicare is no longer a someday topic. It’s a this-year topic. The decisions you make over the next 12 months, when to enroll, which coverage to choose, how to budget for premiums, can shape your healthcare costs for the rest of retirement. Most of the costly Medicare mistakes happen because people start learning about it too late.
This post walks through the core parts of Medicare, enrollment timing and deadlines, how to choose between supplement and advantage plans, and what healthcare costs actually look like in retirement.
Key Takeaways
- Medicare has four main parts, and each one covers a different slice of your healthcare
- Your Initial Enrollment Period starts 3 months before you turn 65, so planning at 64 is the right move
- Late enrollment penalties for Part B and Part D can follow you permanently
- Choosing between Medicare Supplement and Medicare Advantage affects your provider access, costs, and flexibility
- Healthcare spending tends to grow through retirement, and income can raise your premiums
Understanding the Core Parts of Medicare
Medicare is divided into several components, each covering different types of healthcare services. Here’s how the pieces fit together.
Medicare Part A: Hospital Insurance
Part A covers inpatient hospital care, skilled nursing facility stays, hospice services, and limited home health services. It’s the foundation of Medicare coverage.
Most people qualify for premium-free Part A based on their own work history or a spouse’s. If you or your spouse paid Medicare taxes for at least 10 years (40 quarters), you won’t pay a monthly premium for Part A. (Verify: current for 2026)
Medicare Part B: Medical Insurance
Part B covers outpatient care. Doctor visits, preventive services, diagnostic testing, and durable medical equipment all fall under this part.
Unlike Part A, Part B requires a monthly premium. The standard premium in 2026 is $185.00 per month (Verify: current for 2026), but higher-income households pay more through a surcharge called IRMAA.
Medicare Part D: Prescription Drug Coverage
Part D provides coverage for prescription medications through private insurance plans. You enroll in a Part D plan separately from Parts A and B.
Plan structures and covered medications vary between providers. The formulary (the list of drugs a plan covers) can differ significantly from one plan to the next. If you take specific medications, checking formularies before enrolling matters.
Medicare Advantage (Part C) as an Alternative Structure
Medicare Advantage plans are private insurance plans that combine Parts A and B coverage into a single plan. They often include additional benefits like prescription drug coverage, dental, vision, or hearing services.
These plans typically operate with provider networks and managed care structures. That means your choice of doctors and hospitals may be more limited than with Original Medicare, but your out-of-pocket costs may be more predictable.
Enrollment Timing and Key Medicare Deadlines
Understanding when and how to enroll is one of the most important Medicare decisions. Getting the timing wrong can mean gaps in coverage or permanent penalties.
The Initial Enrollment Period (IEP)
Your IEP is a 7-month window centered around the month you turn 65. It begins 3 months before your birthday month, includes the month itself, and extends 3 months after.
If you’re turning 65 in October, for example, your IEP runs from July through January. At 64, that window is close enough to start planning now.
Why Timing Matters for Coverage
Enrolling early in your IEP helps ensure coverage begins when expected. If you sign up during the 3 months before your birthday month, coverage generally starts the first day of your birthday month.
Delayed enrollment within the IEP can push your coverage start date back by 1 to 3 months. That gap matters if you’re leaving employer coverage on a specific date.
Late Enrollment Penalties to Be Aware Of
Part B penalties can apply if you delay enrollment without qualifying coverage. The penalty adds 10% to your Part B premium for each full 12-month period you could have had Part B but didn’t. That surcharge lasts as long as you have Part B. (Verify: current for 2026)
Part D penalties work similarly. If you go 63 continuous days or more without creditable prescription drug coverage, you may pay a late enrollment penalty when you do sign up. (Verify: current for 2026)
Situations Where Enrollment May Be Delayed
Not everyone needs to enroll at 65. Individuals continuing to work with qualifying employer health coverage through an employer with 20 or more employees can typically delay Part B without penalty. (Verify: current for 2026)
Spouses covered under an active employer health plan may also qualify. The key word is “active.” COBRA and retiree health plans generally don’t count as qualifying coverage for this purpose.
Choosing Between Medicare Supplement and Medicare Advantage Plans
After enrolling in Medicare Parts A and B, individuals typically choose how to structure their coverage. This is one of the bigger decisions in the process.
Medicare Supplement (Medigap) Plans
Medigap plans are designed to cover certain out-of-pocket costs not paid by Original Medicare, things like copayments, coinsurance, and deductibles.
These plans generally allow broad access to providers that accept Medicare. You can see any doctor or specialist nationwide who takes Medicare, without needing referrals.
Medicare Advantage Plans
Medicare Advantage plans replace Original Medicare coverage with a private plan. They often bundle Part D drug coverage and extras like dental or vision.
The tradeoff: most Advantage plans operate within provider networks. You may need referrals for specialists, and out-of-network care can cost significantly more.
Factors Retirees Often Consider When Comparing Options
The right choice depends on your situation. Here are the factors that come up most often:
- Monthly premium costs and total out-of-pocket exposure across the year
- Flexibility in choosing doctors and whether your preferred providers are in-network
- Prescription drug coverage and whether the plan’s formulary covers your medications
- Additional benefits like dental, vision, hearing, or wellness programs
Planning for Healthcare Costs in Retirement
Healthcare expenses can become a significant part of retirement spending, making early planning important. A Fidelity estimate put the average couple’s lifetime retirement healthcare costs at $315,000 (Verify: current for 2026). Planning for that number starts before you enroll.
The Main Categories of Medicare-Related Costs
Medicare isn’t free, even with premium-free Part A. The ongoing costs break into three main categories:
- Monthly premiums for Part B, Part D, and any supplement or Advantage plan
- Deductibles and copayments for hospital stays, doctor visits, and procedures
- Prescription drug expenses that vary depending on your plan and the medications you take
Why Healthcare Costs Can Change Over Time
Medical needs often evolve through retirement. The coverage that works at 65 may not fit at 75 or 85.
Healthcare inflation has historically outpaced general inflation. Over the past decade, medical care costs have risen roughly 3–4% annually compared to about 2–3% for overall inflation. (Verify: current for 2026) That compounds over a 20- or 30-year retirement.
Income-Related Adjustments to Medicare Premiums
Higher-income households pay additional premiums through IRMAA (Income-Related Monthly Adjustment Amount). Medicare looks at your modified adjusted gross income from 2 years prior to set your current surcharge.
That big IRA withdrawal you made at 63? Medicare remembers it. Two years later, when you’re 65, it can raise your Part B and Part D premiums. Planning income carefully during the transition into retirement can help manage these surcharges.
Medicare Basics: What to Know at 64 FAQs
When Should I Start Preparing for Medicare Enrollment?
Start at least 12 months before you turn 65. That gives you time to understand your options, compare plans, and coordinate with any employer coverage. Many of the decisions that affect your costs and coverage require lead time, not last-minute research.
What Happens If I Miss My Medicare Enrollment Window?
If you miss your Initial Enrollment Period and don’t have qualifying employer coverage, you may face a coverage gap until the next General Enrollment Period (January 1 through March 31 each year). Coverage wouldn’t start until July 1. You may also owe late enrollment penalties that increase your premiums permanently.
Can I Delay Medicare If I Am Still Working at Age 65?
Yes, if you have health coverage through your own employer (or your spouse’s employer) with 20 or more employees. You’ll qualify for a Special Enrollment Period once that coverage ends, allowing you to sign up without penalty. COBRA and retiree plans typically don’t count.
What Is the Difference Between Medicare Supplement and Medicare Advantage Plans?
Medicare Supplement (Medigap) works alongside Original Medicare and helps pay out-of-pocket costs like copays and deductibles. You keep broad provider access. Medicare Advantage replaces Original Medicare with a private plan, often adding drug coverage and extras, but typically limits you to a network of providers.
Does Medicare Cover All Healthcare Costs in Retirement?
No. Medicare doesn’t cover long-term care, most dental and vision services, or hearing aids under Original Medicare. Out-of-pocket costs like premiums, deductibles, and copays continue throughout retirement. Supplemental coverage and personal savings are important pieces of the picture.
How Do Income Levels Affect Medicare Premiums?
Medicare uses your modified adjusted gross income (MAGI) from 2 years prior to determine if you owe an IRMAA surcharge on Part B and Part D premiums. Higher income means higher premiums. Planning withdrawals, Roth conversions, and other income events carefully can help keep premiums manageable.
How We Help Clients Prepare for Medicare and Healthcare Costs in Retirement
Medicare enrollment is one piece of a larger retirement puzzle. We work with clients to evaluate Medicare coverage options alongside income planning, tax strategy, and healthcare budgeting, so the pieces fit together nicely without creating surprises.
That means helping coordinate enrollment timing with your retirement date, avoiding penalties, and building a long-term plan for healthcare expenses that accounts for inflation and changing needs.
If you’re approaching 65 and want a clear picture of how Medicare fits into your retirement plan, schedule a complimentary consultation to talk through your situation.
This content is for educational purposes only and should not be considered medical or insurance advice. Calamita Wealth Management is a fee-only fiduciary financial planning firm. We do not sell insurance products. For specific Medicare enrollment questions, contact Medicare directly at 1-800-MEDICARE or visit Medicare.gov.
